switch vboot scripts/keys to installed sdk paths

This way we can work on minilayout setups.  Add a comment to prevent
future breakage.

BUG=chromium:687790
TEST=precq passes

Change-Id: Id1eddf67d58d60868c8b31ca4310744cf43b224c
Reviewed-on: https://chromium-review.googlesource.com/453061
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
1 file changed